I'm trying to produce a correlation table of two nominal attributes from a clustered dataset (Ripley). I'm striving for a correlation table of [label]:[cluster]. My problem is that the attributes are shown as "?" in the correlation table. Anybody knows?
The generated attribute cluster is a nominal attribute. The Correlation Matrix operator calculates the Pearson correlation coefficient, which cannot be computed for nominal (=discrete) attributes, thus the correlation is unknown ("missing", displayed as a ?).
